Edit tour

Windows Analysis Report
prevhost.exe

Overview

General Information

Sample name:	prevhost.exe
Analysis ID:	1592539
MD5:	ef917f8e0dab8500f8bf201c3dcc9ea7
SHA1:	a6949bd943e11c032f3e0f420badb75519eb169a
SHA256:	531942d43420fe260b4dd4279920fc31c6c6bd0a9c64b61be3fad36cb7507482

Detection

Score:	1
Range:	0 - 100
Whitelisted:	false
Confidence:	80%

Signatures

Binary contains a suspicious time stamp

Program does not show much activity (idle)

Uses 32bit PE files

Classification

Process Tree

System is w10x64

prevhost.exe (PID: 4052 cmdline: "C:\Users\user\Desktop\prevhost.exe" MD5: EF917F8E0DAB8500F8BF201C3DCC9EA7)

cleanup

Malware Configuration

⊘No configs have been found

Yara Signatures

⊘No yara matches

Sigma Signatures

⊘No Sigma rule has matched

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

There are no malicious signatures, click here to show all signatures.

Source: prevhost.exe

Static PE information: EXECUTABLE_IMAGE, 32BIT_MACHINE

Source: prevhost.exe

Static PE information: DYNAMIC_BASE, NX_COMPAT, GUARD_CF, TERMINAL_SERVER_AWARE

Source:	Binary string: prevhost.pdb source: prevhost.exe
Source:	Binary string: prevhost.pdbGCTL source: prevhost.exe

Source: prevhost.exe

Static PE information: EXECUTABLE_IMAGE, 32BIT_MACHINE

Source: classification engine

Classification label: clean1.winEXE@1/0@0/0

Source: prevhost.exe

Static PE information: Section: .text IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ

Source: C:\Users\user\Desktop\prevhost.exe

Key opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers

Jump to behavior

Source: C:\Users\user\Desktop\prevhost.exe	Section loaded: kernel.appcore.dll			Jump to behavior
Source: C:\Users\user\Desktop\prevhost.exe	Section loaded: uxtheme.dll			Jump to behavior

Source: prevhost.exe	Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_IMPORT
Source: prevhost.exe	Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_RESOURCE
Source: prevhost.exe	Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_BASERELOC
Source: prevhost.exe	Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_DEBUG
Source: prevhost.exe	Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG
Source: prevhost.exe	Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_IAT

Source: prevhost.exe

Static PE information: DYNAMIC_BASE, NX_COMPAT, GUARD_CF, TERMINAL_SERVER_AWARE

Source: prevhost.exe

Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_DEBUG

Source:	Binary string: prevhost.pdb source: prevhost.exe
Source:	Binary string: prevhost.pdbGCTL source: prevhost.exe

Source: prevhost.exe

Static PE information: 0xC0C8E170 [Wed Jun 29 01:46:24 2072 UTC]

Source: all processes

Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected

Source: all processes

Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected

Mitre Att&ck Matrix

Reconnaissance	Resource Development	Initial Access	Execution	Persistence	Privilege Escalation	Defense Evasion	Credential Access	Discovery	Lateral Movement	Collection	Command and Control	Exfiltration	Impact
Gather Victim Identity Information	Acquire Infrastructure	Valid Accounts	Windows Management Instrumentation	1 DLL Side-Loading	1 DLL Side-Loading	1 Timestomp	OS Credential Dumping	1 System Information Discovery	Remote Services	Data from Local System	Data Obfuscation	Exfiltration Over Other Network Medium	Abuse Accessibility Features
Credentials	Domains	Default Accounts	Scheduled Task/Job	Boot or Logon Initialization Scripts	Boot or Logon Initialization Scripts	1 DLL Side-Loading	LSASS Memory	Application Window Discovery	Remote Desktop Protocol	Data from Removable Media	Junk Data	Exfiltration Over Bluetooth	Network Denial of Service

Behavior Graph

Hide Legend

Legend:

Process
Signature
Created File
DNS/IP Info
Is Dropped
Is Windows Process
Number of created Registry Values
Number of created Files
Visual Basic
Delphi
Java
.Net C# or VB.NET
C, C++ or other language
Is malicious
Internet

Screenshots

Thumbnails

This section contains all screenshots as thumbnails, including those not shown in the slideshow.

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Source	Detection	Scanner	Label	Link
prevhost.exe	0%	Virustotal		Browse
prevhost.exe	0%	ReversingLabs

Dropped Files

⊘No Antivirus matches

Unpacked PE Files

⊘No Antivirus matches

Domains

⊘No Antivirus matches

URLs

⊘No Antivirus matches

Domains and IPs

Contacted Domains

⊘No contacted domains info

World Map of Contacted IPs

⊘No contacted IP infos

General Information

Joe Sandbox version:	42.0.0 Malachite
Analysis ID:	1592539
Start date and time:	2025-01-16 09:12:43 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 1m 40s
Hypervisor based Inspection enabled:	false
Report type:	full
Cookbook file name:	default.jbs
Analysis system description:	Windows 10 x64 22H2 with Office Professional Plus 2019, Chrome 117, Firefox 118, Adobe Reader DC 23, Java 8 Update 381, 7zip 23.01
Number of analysed new started processes analysed:	2
Number of new started drivers analysed:	0
Number of existing processes analysed:	0
Number of existing drivers analysed:	0
Number of injected processes analysed:	0
Technologies:	EGA enabled AMSI enabled
Analysis Mode:	default
Analysis stop reason:	Timeout
Sample name:	prevhost.exe
Detection:	CLEAN
Classification:	clean1.winEXE@1/0@0/0
Cookbook Comments:	Found application associated with file extension: .exe Stop behavior analysis, all processes terminated

Warnings

Exclude process from analysis (whitelisted): dllhost.exe
Excluded IPs from analysis (whitelisted): 13.107.246.45
Excluded domains from analysis (whitelisted): client.wns.windows.com, otelrules.azureedge.net

Simulations

Behavior and APIs

⊘No simulations

Input	Output
URL: email Model: Joe Sandbox AI	{ "risk_score": 1, "reasoning": [ "No headers provided to analyze", "Cannot make security assessment without header information", "Default to low risk score due to lack of evidence" ] }
Date: unknown

Joe Sandbox View / Context

IPs

⊘No context

Domains

⊘No context

ASNs

⊘No context

JA3 Fingerprints

⊘No context

Dropped Files

⊘No context

Created / dropped Files

⊘No created / dropped files found

Static File Info

General

File type:	PE32 executable (GUI) Intel 80386, for MS Windows
Entropy (8bit):	6.055013874894348
TrID:	Win32 Executable (generic) a (10002005/4) 99.96% Generic Win/DOS Executable (2004/3) 0.02% DOS Executable Generic (2002/1) 0.02% Autodesk FLIC Image File (extensions: flc, fli, cel) (7/3) 0.00%
File name:	prevhost.exe
File size:	27'648 bytes
MD5:	ef917f8e0dab8500f8bf201c3dcc9ea7
SHA1:	a6949bd943e11c032f3e0f420badb75519eb169a
SHA256:	531942d43420fe260b4dd4279920fc31c6c6bd0a9c64b61be3fad36cb7507482
SHA512:	9979e6b7082b5d3880cbc1518e09041c94ebc8c77c5fdfe745b3847ba8279143bbb6a95285693a65ae004254038bb4fb6de2469910448b7d9e196f63fb6a5223
SSDEEP:	384:t5n6YGYpeQpKp0ckCkh9RR8bikNUAwzhAcEHozBqWgelxm2fMwSZrAyf9WQcWgq:Dn6YpQQpKp0eTyycEHAqLr2fM7Ayfh/
TLSH:	5BC2199265DC5171DAF227B0056DF229D13FB5A04B9184C3662C4BFEBB397C0AE7029B
File Content Preview:	MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$......._.................y.....P.......P.......P.......P...........L...P.......P.......P.......Rich....................PE..L...p......

File Icon


Icon Hash:	00928e8e8686b000

Static PE Info

General

Entrypoint:	0x404e30
Entrypoint Section:	.text
Digitally signed:	false
Imagebase:	0x400000
Subsystem:	windows gui
Image File Characteristics:	EXECUTABLE_IMAGE, 32BIT_MACHINE
DLL Characteristics:	DYNAMIC_BASE, NX_COMPAT, GUARD_CF, TERMINAL_SERVER_AWARE
Time Stamp:	0xC0C8E170 [Wed Jun 29 01:46:24 2072 UTC]
TLS Callbacks:
CLR (.Net) Version:
OS Version Major:	10
OS Version Minor:	0
File Version Major:	10
File Version Minor:	0
Subsystem Version Major:	10
Subsystem Version Minor:	0
Import Hash:	64ad0500b99b03083d39c3f6afaf2c66

Entrypoint Preview

Instruction
call 00007FDF1455DD79h
jmp 00007FDF1455D58Ch
int3
int3
int3
int3
int3
int3
int3
push 00000058h
push 00405860h
call 00007FDF1455DE24h
xor ebx, ebx
mov dword ptr [ebp-20h], ebx
lea eax, dword ptr [ebp-68h]
push eax
call dword ptr [004070F8h]
mov dword ptr [ebp-04h], ebx
mov eax, dword ptr fs:[00000018h]
mov esi, dword ptr [eax+04h]
mov edi, ebx
mov edx, 00406490h
mov ecx, esi
xor eax, eax
lock cmpxchg dword ptr [edx], ecx
test eax, eax
je 00007FDF1455D59Ah
cmp eax, esi
jne 00007FDF1455D589h
xor esi, esi
inc esi
mov edi, esi
jmp 00007FDF1455D592h
push 000003E8h
call dword ptr [0040710Ch]
jmp 00007FDF1455D559h
xor esi, esi
inc esi
cmp dword ptr [00406494h], esi
jne 00007FDF1455D58Ch
push 0000001Fh
call 00007FDF1455DB86h
pop ecx
jmp 00007FDF1455D5BCh
cmp dword ptr [00406494h], ebx
jne 00007FDF1455D5AEh
mov dword ptr [00406494h], esi
push 00401188h
push 0040117Ch
call 00007FDF1455D6E6h
pop ecx
pop ecx
test eax, eax
je 00007FDF1455D599h
mov dword ptr [ebp-04h], FFFFFFFEh
mov eax, 000000FFh
jmp 00007FDF1455D6B9h
mov dword ptr [00406064h], esi
cmp dword ptr [00406494h], esi
jne 00007FDF1455D59Dh
push 00401178h
push 00401160h
call 00007FDF1455DD6Ch

Rich Headers

Programming Language:

[IMP] VS2008 SP1 build 30729

Data Directories

Name	Virtual Address	Virtual Size	Is in Section
IMAGE_DIRECTORY_ENTRY_EXPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_IMPORT	0x7198	0x118	.idata
IMAGE_DIRECTORY_ENTRY_RESOURCE	0x8000	0x8e8	.rsrc
IMAGE_DIRECTORY_ENTRY_EXCEPTION	0x0	0x0
IMAGE_DIRECTORY_ENTRY_SECURITY	0x0	0x0
IMAGE_DIRECTORY_ENTRY_BASERELOC	0x9000	0x4b0	.reloc
IMAGE_DIRECTORY_ENTRY_DEBUG	0x1548	0x54	.text
IMAGE_DIRECTORY_ENTRY_COPYRIGHT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_GLOBALPTR	0x0	0x0
IMAGE_DIRECTORY_ENTRY_TLS	0x0	0x0
IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG	0x10a0	0xc0	.text
IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_IAT	0x7000	0x190	.idata
IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR	0x0	0x0
IMAGE_DIRECTORY_ENTRY_RESERVED	0x0	0x0

Sections

Name	Virtual Address	Virtual Size	Raw Size	MD5	Xored PE	ZLIB Complexity	File Type	Entropy	Characteristics
.text	0x1000	0x4934	0x4a00	3bc516aebc136005f4913c3fb7e49f1e	False	0.5591744087837838	data	6.195324562861127	IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
.data	0x6000	0x500	0x200	050be2aede47ce3d2bdc6d3e1b52e0d2	False	0.068359375	data	0.28578180731160896	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ, IMAGE_SCN_MEM_WRITE
.idata	0x7000	0xb1e	0xc00	a982691b91c8fd9c14fca5f82ab3b371	False	0.4329427083333333	x86 executable	4.770627592688134	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ
.rsrc	0x8000	0x8e8	0xa00	bb81545586817a7ca0bdd70f2b88e3c1	False	0.3953125	data	4.406409887054605	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ
.reloc	0x9000	0x4b0	0x600	5852eb4ce70f53349a7fee3474e5c4c2	False	0.7096354166666666	data	5.727686765440488	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ

Resources

Name	RVA	Size	Type	Language	Country	ZLIB Complexity
RT_VERSION	0x8538	0x3ac	data	English	United States	0.46808510638297873
RT_MANIFEST	0x80a0	0x493	XML 1.0 document, ASCII text, with CRLF line terminators	English	United States	0.43552519214346713

Imports

DLL	Import
KERNEL32.dll	GetModuleHandleExW, WaitForSingleObject, GetCurrentThreadId, ReleaseMutex, CreateEventW, FormatMessageW, GetLastError, OutputDebugStringW, SetEvent, WaitForSingleObjectEx, ReleaseSemaphore, CloseHandle, HeapSetInformation, HeapAlloc, GetProcAddress, CreateMutexExW, GetCurrentProcessId, GetProcessHeap, GetModuleHandleW, DebugBreak, IsDebuggerPresent, SetLastError, HeapFree, CreateSemaphoreExW, OpenSemaphoreW, GetModuleFileNameA
USER32.dll	PeekMessageW, DispatchMessageW, MsgWaitForMultipleObjects, TranslateMessage
msvcrt.dll	__setusermatherr, _initterm, free, __CxxFrameHandler3, _exit, _except_handler4_common, _unlock, _cexit, __p__fmode, exit, __dllonexit, _lock, _onexit, ?terminate@@YAXXZ, _controlfp, _ismbblead, _callnewh, malloc, memcpy_s, _vsnwprintf, __set_app_type, __getmainargs, _amsg_exit, __p__commode, _XcptFilter, _acmdln, memset
api-ms-win-core-com-l1-1-0.dll	CoInitializeEx, CLSIDFromString, CoRegisterSurrogate, CoRevokeClassObject, CoGetInterfaceAndReleaseStream, CoFreeUnusedLibraries, CoUninitialize, CoInitializeSecurity, CoMarshalInterThreadInterfaceInStream, CoReleaseMarshalData, CoRegisterClassObject, CoCreateInstance
api-ms-win-core-com-l1-1-1.dll	RoGetAgileReference
api-ms-win-core-synch-l1-2-0.dll	Sleep
api-ms-win-core-processthreads-l1-1-0.dll	TerminateProcess, GetStartupInfoW, GetCurrentProcess
api-ms-win-core-errorhandling-l1-1-0.dll	SetUnhandledExceptionFilter, UnhandledExceptionFilter
api-ms-win-core-profile-l1-1-0.dll	QueryPerformanceCounter
api-ms-win-core-sysinfo-l1-1-0.dll	GetSystemTimeAsFileTime, GetTickCount
COMCTL32.dll
SHELL32.dll
SHLWAPI.dll

Possible Origin

Language of compilation system	Country where language is spoken	Map
English	United States

Network Behavior

⊘No network behavior found

Statistics

CPU Usage

Click to jump to process

Memory Usage

Click to jump to process

System Behavior

Analysis Process: prevhost.exePID: 4052, Parent PID: 4004

General

Target ID:	0
Start time:	03:13:35
Start date:	16/01/2025
Path:	C:\Users\user\Desktop\prevhost.exe
Wow64 process (32bit):	true
Commandline:	"C:\Users\user\Desktop\prevhost.exe"
Imagebase:	0xad0000
File size:	27'648 bytes
MD5 hash:	EF917F8E0DAB8500F8BF201C3DCC9EA7
Has elevated privileges:	true
Has administrator privileges:	true
Programmed in:	C, C++ or other language
Reputation:	low
Has exited:	true

Show Windows behavior

Chronological Activities

Disassembly

⊘No disassembly

Description:	Adversaries may execute their own malicious payloads by side-loading DLLs. Similar to DLL Search Order Hijacking , side-loading involves hijacking which DLL a program loads. But rather than just planting the DLL within the search order of a program then waiting for the victim application to be invoked, adversaries may directly side-load their payloads by planting then invoking a legitimate application that executes their payload(s).
Tactics:	Defense Evasion, Persistence, Privilege Escalation
Data Sources:	File: File Creation, File: File Modification, Module: Module Load, Process: Process Creation
Platforms:	Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may modify file time attributes to hide new or changes to existing files. Timestomping is a technique that modifies the timestamps of a file (the modify, access, create, and change times), often to mimic files that are in the same folder. This is done, for example, on files that have been modified or created by the adversary so that they do not appear conspicuous to forensic investigators or file analysis tools.
Tactics:	Defense Evasion
Data Sources:	File: File Metadata, File: File Modification
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	An adversary may attempt to get detailed information about the operating system and hardware, including version, patches, hotfixes, service packs, and architecture. Adversaries may use the information from System Information Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	Command: Command Execution, Process: OS API Execution, Process: Process Creation
Platforms:	IaaS, Linux, macOS, Network, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

Loading Joe Sandbox Report ...

Warning!

Windows Analysis Report prevhost.exe

Overview

General Information

Detection

Signatures

Classification

Process Tree

Malware Configuration

Yara Signatures

Sigma Signatures

Suricata Signatures

Joe Sandbox Signatures

Compliance

System Summary

Data Obfuscation

Malware Analysis System Evasion

Anti Debugging

Mitre Att&ck Matrix

Behavior Graph

Screenshots

Thumbnails

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Dropped Files

Unpacked PE Files

Domains

URLs

Domains and IPs

Contacted Domains

World Map of Contacted IPs

General Information

Warnings

Simulations

Behavior and APIs

LLM Input / Output

Joe Sandbox View / Context

IPs

Domains

ASNs

JA3 Fingerprints

Dropped Files

Created / dropped Files

Static File Info

General

File Icon

Static PE Info

General

Entrypoint Preview

Rich Headers

Data Directories

Sections

Resources

Imports

Possible Origin

Network Behavior

Statistics

CPU Usage

Memory Usage

System Behavior

Analysis Process: prevhost.exePID: 4052, Parent PID: 4004

General

Chronological Activities

Disassembly

Windows Analysis Report
prevhost.exe